Check in codegen test expectations.

test/codegen/expect/language/private_selector_test.js

+dart_library.library('language/private_selector_test', null, /* Imports */[
+  'dart_sdk',
+  'expect'
+], function load__private_selector_test(exports, dart_sdk, expect) {
+  'use strict';
+  const core = dart_sdk.core;
+  const dart = dart_sdk.dart;
+  const dartx = dart_sdk.dartx;
+  const expect$ = expect.expect;
+  const private_selector_test = Object.create(null);
+  const private_selector_lib = Object.create(null);
+  let VoidTodynamic = () => (VoidTodynamic = dart.constFn(dart.definiteFunctionType(dart.dynamic, [])))();
+  const _private = Symbol('_private');
+  private_selector_lib.A = class A extends core.Object {
+    public() {
+      new private_selector_test.B()[_private]();
+    }
+    [_private]() {
+      private_selector_lib.executed = true;
+    }
+  };
+  dart.setSignature(private_selector_lib.A, {
+    methods: () => ({
+      public: dart.definiteFunctionType(dart.dynamic, []),
+      [_private]: dart.definiteFunctionType(dart.dynamic, [])
+    })
+  });
+  private_selector_test.B = class B extends private_selector_lib.A {};
+  private_selector_test.main = function() {
+    new private_selector_lib.A().public();
+    expect$.Expect.isTrue(private_selector_lib.executed);
+  };
+  dart.fn(private_selector_test.main, VoidTodynamic());
+  private_selector_lib.executed = false;
+  // Exports:
+  exports.private_selector_test = private_selector_test;
+  exports.private_selector_lib = private_selector_lib;
+});